Angles formed by opposite rays. Angles that share a common side and a common vertex, but have no common interior points.

Angles formed by opposite rays.

Angles that share a common side and a common vertex, but have no common interior points.

Two angle whose measures have a sum of 90 degrees.

or

Two angles whose measures have a sum of 180 degrees.

or ?135

Name a pair of vertical angles.

Name a pair of adjacentAngles.

Name a pair of complementary angles.

Name a pair of supplementary angles.

When looking at a diagram, we can conclude:

Vertical angles

Adjacent angles

Adjacent supplementary angles

Angles or segments are congruent

Angles are right angles

Lines are parallel or perpendicular

(unless there are marks that give this information)

Draw two intersecting lines.

Number the angles as shown.

Use a protractor to measure each angle.

Make a conjecture about vertical angles.

If two angles are complementary to the same angle (or congruent angles), then the two angles are congruent.

If two angles are supplementary to the same angle (or congruent angles), then the two angles are congruent.

All right angles are congruent.

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